Many of our customers tell us they stopped using these ED pills because of the expensive cost and the severe side effects. The most common reported side effects are headache, flushing, and dyspepsia. Blurry vision and blue tinged vision are also side effects only commonly reported in Viagra (2% with 50 mg, and 11% with 100 mg), and less common (<2% reported) in Cialis or Levitra. Another reported side effect is an elevated heart rate and a feeling of being lightheaded with excessive sweating. The ErektorFlex™ is a natural ED alternative that works immediately. It does not require a 1-2 hour waiting period like ED pills. The ErektorFlex™ also has no known side effects.